??????????????!???????2??12??????????
???????(????)????????????????????25%;?????????Χ??С(????????????????????????????λ)
????????(????)?????????????8????????6??
???(????)???????????6%
????????(????)???л???????????????
?????????(???)??????????1.5????????1.4??
??????(???)????С???????4???????3.5??
???????(???)??????????1.4????????1.3??;?????????5%
?μ???濨??????????????????????
PS??????????????????????????????????????????????????????????
???????
???????
